Thermostat.



H. N. IVIOTSINGER.

THERMOSTAT.

APPLICATION FILED 11111211.1914.

Patented June 13, 1916.

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HOMER N.-1VIOTSINGER, OF LA FAYETTE, INDIANA, ASSIGNOR T0 MOTSINGER DEVICE MANUFACTURING- COMPAN'Y, OF LA FAYETTE, INDIANA, A CORPORATION OF INDIANA.

THERMOSTAT.

Application led January 29, 1914. Serial No. 815,156.

To all whom t may concern:

Be it known that I, HOMER N. MOTSINGER, a citizen of the United States, residing at La Fayette, in thecounty of Tippecanoe and State of Indiana, have invented a new and useful Thermostat, of which'the following is a specification.

The object of my invention is to produce a thermostat of novel form wherein the variably expansible elements are so associated that one dimension of the structureconsidered as a whole will be increased upon a lowering of the temperature of the apparatus.

Under certain conditions of assemblage of the elements of my thermostat, one dimensionA of the structure considered as a whole will automatically increase upon a variation of temperature in either direction from a predetermined zero, and under another condition of assemblage one dimension of the device will increase upon a rise of temperature.

Fundamentally my improved thermostat comprises a pile of alternately arranged elements having dierent coelicients of expansion each intermediate element being connected to both adjacent elements in such manner that under given temperature conditions one set of elements will be bowed relative to the other set. l

The accompanying drawings illustrate an embodiment of my invention, Figure 1 being a plan; Fig. 2 an elevation; and Fig. 3 a perspective, no attempt, however, being made to indicate exact proportions in the draw- In the drawings, A indicates a series of elements of one material and B indicates a series/,of elements of another material having a different coefiicient of expansion from that of the elements A. The. elements A will be all alike and the elements B will be alike, each element A comprising a series of four radiating arms lying at 90 from each other and each element B comprising a series of four radiating arms arrangedpin pairs 45 from each other.

In the drawings I have shown a thermostatic pile comprlsing three of each kind of elements A and B and for convenience I have independently designated them as follows: The upper element A comprises a pair of arms 10, 10 and a pair of arms 11, 11. The next subjacent element B comprises a pair of arms 12, 12, the ends of which are riveted to the ends of arms 10, 10 and also comprising a pair of arms 13, 13v which are riveted to the pair of arms 14, 14 of the next subjacent element A. This causes the. second element A to lie with its arms displaced 450 relative to the arms of the upper element A and t-he arms 15, 15 of this second element A are then riveted to the ends of arms 1G, 16 of a second element B, the other arms 17, 17 of this second element B being riveted to the arms 18, 18 of a next subjacent element A. The arms 19, 19 of the third element A are then riveted to arms 20, 20 of a third element B and the arms 21, 21 of this third element B are then secured .to any suitable support or to another element A, the pile being amplified by the addition of other similar elements to any desired extent.

The height, or what might be termed the axial length, 0f the thermostatic pile is the dimension the variation of which is desired as a result of changes in temperatures and assuming that a thermostatic element is desired which -will expand for decreases in temperature, a satisfactory pile can be produced wit-h elements A of a material having a larger coeiicient of expansion than the elements B, and, in preparing these elements at ordinary temperatures, the distance between rivets in the elements A will be less than the distance between rivet-s in the elements B so that, in assembling parts the elements B must be buckled to compensate the difference in lengths. When the pile has produced in the manner described, a decrease in temperature will cause a greater contraction of the elements A than of the elements B and this will result in a further buckling of the elements B and a consequent expansion of the height or axial length of the thermostatic pile.

It will, of course, be readily understood that, if theelements having the higher coefiicient of expansion are made longer than the other elements and initially buckled, a thermostatic pile would be produced which would increase its height or axial length upon increases of temperature. It will also be understood that if the Apile be produced Specification of Letters Patent. Patntgd June 13, 1916,

at any given temperature, say 70 F. with the distances between rivets of both sets of elements uniform, the elements will lie flat upon each other without buckling at the time of assemblage and there will be an increase in height of the pileupon any change 'of expansion and the difference between the temperature of assemblage and the desired zero and that when the partsmareso assembled a variation in temperature whichl results in a decrease of height of a pile would continue to have that effect until the zero position `of the parts was reached, whereupon a further variation in'temperature in the same direction would produce an increase in the height of the pile.

I have shown in the drawingsa diii'erence in the shape of the`two elements of the pile because in that Way the rivets between closely adjacent pairs of elements will not contact with each other when the pile is in its most compact condition, but it will be readily understood that while the-particular form shown is convenient, it is by no means essential. It will also be understood that the precise means for attaching the several elements together is not material.

I claim as my invention:

l. A thermostatic pile comprising three or more superimposed elements, an intermediate element having a diii'erent coeicient of expansion from the coefficients of expansion of the subjacent and incumbent elements, the'said intermediate element being connected attwo separated points to the incumbent element and connected at two other separated points to the subjacent element.

2. A thermostatic pile comprising elements of diierent coefficients of expansion, each of said elements having two pairs of radiating arms, the arms of some of said elements lying at a smaller angle to each other than theangle between the arms ofl the `other elements, the said elements being interspersed and each intermediate element having one pair of its arms attached to arms of a subjacent element and the other pair of its arms attached to arms of an incumbent element. v

In witness whereof I have hereunto set my hand at Indianapolis, Indiana, this 23rd day of January, A. D. one thousand nine p hundred and fourteen.

HOMER N. MOTSINGER.

Witnesses:

ARTHUR M. Hoon, vFRANK A. FAHLE. 

